ArticlesWhy ice accumulates on cryogenic system vaporizers (USFA)
Bulk medical gas containers are a familiar sight at hospitals, large convalescent centers, and other health care facilities. Generally, oxygen and nitrogen are stored as cryogenic liquids, and nitrous oxide and carbon dioxide are stored as refrigerated liquids. Medical gases often are delivered to patient care rooms and surgery suites through a network of pipes supplied from the bulk storage tanks. Liquefied bulk storage often is the preferred method because of the volume of gases that are used on a regular basis. In order to use gases from a bulk cryogenic vessel, the liquid must be transformed into a gas. Cryogenic liquids are converted to gaseous state using a vaporizer, such as the one illustrated. While steam and electric vaporizers occasionally are used, the most widely employed vaporizers obtain heat from the surrounding air. The most common type of vaporizer is the ambient finned tube vaporizer. The fins absorb the warm ambient air and transfer the heat to the cryogenic liquid flowing in the tube. The heat transfer converts the liquid into a gas. Ice accumulations on these systems are normal. |
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